The Triangulate & Contour command allows you to create a digital representation of a surface model from selected points and polyline breaklines.
- Points: When enabled, existing Points can be incorporated into the surface model.
- Point Range: Indicate the point numbers that should be used for the surface model.
- Point Wildcard Descriptions: Indicate if any specific type of point description(s) or items from the Code List should be used to further filter the available points.
- Draw Contours: When enabled, contours consisting of 2D polylines at their respective elevation values will be drawn into the Map.
- Contour Interval: Indicate the elevation interval at which contours should be drawn
- Include Breaklines: When enabled, any non-zero elevation polylines (e.g. 3D Polylines and/or 2D Polylines (such as contours)) at a non-0 elevation will be treated as local grade-breaks.
- Include Contours: When enabled, the various contour vertex coordinates will be also used within the surface model.
Note: The practice of using contours as the basis of a surface model is generally discouraged due to inherent risks of "flat-spot" areas in the surface should triangulation be formed between any three points along a contour's elevation.
- Erase Previous Contour Entities: When enabled, any previously drawn contours will be removed from the Map so that the triangulation processes uses pure source data.
- Save Triangulation to File: When enabled, the results of the triangulation are stored into an external *.TIN file. Use the Select button to launch the standard File Selector to specify the location and file name.
Note: Once created, the TIN file can be used in commands such as Elevation Difference and/or converted for use in other applications through commands such as DTM to LandXML.
Note: SurvPC TIN files can be used directly by other Carlson products such as Carlson Survey Civil Suite and Takeoff Suite.
- Draw Triangulation: When enabled, graphical representations of the triangulation results (placed as individual closed 3D polylines) will be drawn into the Map.
- Prompt for Inclusions/Exclusions: When enabled, pre-existing closed polylines (2D and/or 3D) can be used to limit the area(s) where triangulation can occur. Upon pressing ✅, prompts include:
-Rem/Prev/Cross/Select inclusions(S)> [count]Specify the desired option(s) to specify polygon area(s) that prevent triangulation from occurring outside the selected inclusion (boundary) polyline(s):- Rem: Removes a previously selected polyline.
- Prev: Selects the previously selected polyline.
- Cross: Use this option to batch select polylines that are inside or cross a rectangular area formed by two graphic pick locations.
- Select inclusions(S): Use this option to individually select the polygon region(s) that are to be used as the inclusion perimeter(s).
Note: Press Enter to continue with the next prompt.
-Rem/Prev/Cross/Select exclusions(S)> [count]Specify the desired option(s) to specify polygon area(s) that prevent triangulation from occurring inside the selected exclusion (void area) polyline(s) (i.e. areas inside building footprints).Note: The various switch options are the same as those described above.